ios - 我想获取屏幕左侧的后退按钮，但无法获取它

Question

file:///Users/anuragpanchal/Desktop/Simulator%20Screen%20Shot%20-%20iPhone%208%20Plus%20-%202018-10-11%20at%2014.18.24.png

我在 View 上调用的后退按钮代码将出现 func

//MARK: Navigation button
func backNavigationButton()  {
    let button1 = UIBarButtonItem(image: UIImage(named: "back.png"), style: .plain, target: self, action: #selector(actionBackButton)) //
    self.navigationItem.leftBarButtonItem = button1

}

@objc func actionBackButton()  {
    // PopToHome()
    self.navigationController?.popViewController(animated: true)
}

Answer 1

早期版本的 iOS 使用此代码:

let leftBarItem = UIBarButtonItem(image: leftImage, style: .done, target: target, action: leftImageSelector)

对于 iOS 11 或更高版本，您需要添加一个间隔符，因为苹果更改了按钮的布局:

let spacer = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.fixedSpace, target: self, action: nil)
        spacer.width = 5
        self.navigationItem.leftBarButtonItems = [spacer, leftBarItem]